The limit for file uploads is 10MB. Most large files should be optimized for the web so that visitors can view them when accessing your site via a slower connection. Large PDFs can be optimized using using the Acrobat Pro “Save as Other” function. Often the file size is reduced dramatically. Be sure to save with a new file name so you don’t lose the original file.
FITC can help optimize large PDF files if you do not have Acrobat Pro. Submit a ticket if you require help in optimizing files. Make sure to mention you are using WordPress and the nature and size of the large file you need hosted.
Large images can be optimized using any number of photo editing applications including those that come bundled with Mac and Windows as well as various free online editors like Pixlr.com. Be sure to save with a new file name so you don’t lose the original file. Find out more about optimizing images.